WMAQ was an AM radio station located in Chicago, Illinois, USA, and broadcast at 670 kHz with 50,000 watts. The station was in existence from 1922 to 2000, and was the oldest surviving broadcast outlet in Chicago. It was a class A clear channel station, and could be heard, particularly at night, over most of the eastern United States. WMAQ was owned in its later years by CBS Radio, but for much of its life it was owned by National Broadcasting Company (NBC), and later Westinghouse Broadcasting. The station's original owner was the Chicago Daily News newspaper, but its longest-running ownership was as an NBC Radio owned-and-operated station. Its transmitter was located in Bloomingdale, Illinois just off Army Trail Road, with a 780-foot tower where it remains today, with the callsign still on the exterior facade. The AM 670 transmitter is now in use by WMAQ's successor, All Sports Radio WSCR, and remains under CBS Radio ownership.